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Optimal subsampling for functional quantile regression

Author

Listed:
  • Qian Yan

    (Chongqing University)

  • Hanyu Li

    (Chongqing University)

  • Chengmei Niu

    (Chongqing University)

Abstract

Subsampling is an efficient method to deal with massive data. In this paper, we investigate the optimal subsampling for linear quantile regression when the covariates are functions. The asymptotic distribution of the subsampling estimator is first derived. Then, we obtain the optimal subsampling probabilities based on the A-optimality criterion. Furthermore, the modified subsampling probabilities without estimating the densities of the response variables given the covariates are also proposed, which are easier to implement in practise. Numerical experiments on synthetic and real data show that the proposed methods always outperform the one with uniform sampling and can approximate the results based on full data well with less computational efforts.

Suggested Citation

  • Qian Yan & Hanyu Li & Chengmei Niu, 2023. "Optimal subsampling for functional quantile regression," Statistical Papers, Springer, vol. 64(6), pages 1943-1968, December.
    • Handle: RePEc:spr:stpapr:v:64:y:2023:i:6:d:10.1007_s00362-022-01367-z
    DOI: 10.1007/s00362-022-01367-z
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    References listed on IDEAS

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